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-rw-r--r--mammoth/docx/numbering_xml.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mammoth/docx/numbering_xml.py b/mammoth/docx/numbering_xml.py
index 4614d0e..0bd1952 100644
--- a/mammoth/docx/numbering_xml.py
+++ b/mammoth/docx/numbering_xml.py
@@ -51,7 +51,7 @@ def _read_abstract_num_levels(element):
else:
levels[level.level_index] = level
- if "0" not in levels and level_without_index is not None:
+ if level_without_index is not None and level_without_index.level_index not in levels:
levels[level_without_index.level_index] = level_without_index
return levels